#RestController custom ResponseEntity - Jackson - json

Question

What i'm trying to achieve here is to get a custom response from the RequestMapping, below is the structure of the json which I'm trying to get in case of an array of objects:
{
"error": false,
"message": "the message",
"data": [{},{},...]
}
and the below in case of object
{
"error": false,
"message": "the message",
"data": {}
}
The code is working fine but the problem is "data" will not always has an array, it may store an object, so what I tried is to create a custom POJO class which contains my custom response and when I want to annotate two attributes with same name i'm getting the below error
Could not find acceptable representation
And what if I create another class which will contain the same attributes but with an JsonObject not with array, is there any better way to achieve this ?
Below are my classes :
#JsonInclude(Include.NON_NULL)
public class JsonResponseObject<T> implements java.io.Serializable {
private static final long serialVersionUID = 1L;
private boolean error;
private String message ;
#JsonProperty(value="data")
private ArrayList<T> array;
#JsonProperty(value="data")
private Object object ;
public JsonResponseObject() {
}
public boolean isError() {
return error;
}
public void setError(boolean error) {
this.error = error;
}
public String getMessage() {
return message;
}
public void setMessage(String message) {
this.message = message;
}
public ArrayList<T> getArray() {
return array;
}
public void setArray(ArrayList<T> array) {
this.array = array;
}
public Object getObject() {
return object;
}
public void setObject(Object object) {
this.object = object;
}
}
UserJsonController.java :
#RestController()
#RequestMapping(value = "/json")
public class UserJsonController {
#Autowired
private UserRepository userDAO;
#RequestMapping(value = "/users", method = RequestMethod.GET, produces = MediaType.APPLICATION_JSON_VALUE)
public ResponseEntity<Object> getUsers() {
ArrayList<Users> entityList = (ArrayList<Users>) userDAO.findAll();
JsonResponseObject<Users> jsonResponse = new JsonResponseObject<Users>();
jsonResponse.setError(false);
jsonResponse.setMessage("test");
jsonResponse.setArray(entityList);
return new ResponseEntity<>(jsonResponse, HttpStatus.OK);
}
#RequestMapping(value = "/users/{id}", method = RequestMethod.GET, produces = MediaType.APPLICATION_JSON_VALUE)
public ResponseEntity<Object> getUserByID(#PathVariable int id) {
JsonResponseObject<Users> jsonResponse = new JsonResponseObject<Users>();
jsonResponse.setError(false);
jsonResponse.setMessage("test");
jsonResponse.setObject(userDAO.findById(id).get());
return new ResponseEntity<>(jsonResponse, HttpStatus.OK);
}}